"It is our responsibility to make sure things like this don't happen, and we failed to meet that responsibility", Quora CEO Adam D'Angelo wrote in Monday's post.

The company said it is logging out all Quora users who may have been affected to prevent further damage.

"We have retained a leading digital forensics and security firm to assist us", it said.

"Questions and answers that were written anonymously are not affected by this breach as we do not store the identities of people who post anonymous content", he added. One possibility is that the hackers - should they be able to decipher the stolen encrypted passwords - will try to use the passwords on other websites that a person logs on to, possibly including sites that contain more sensitive information such as credit card details.

It also said that the root cause has been identified, with steps being taken to address the issue. Users who chose the same password to protect accounts on a different service should immediately reset those passwords as well.

The asteroid could pass close to Earth, closer than the moon, in 2135, with even closer approaches possible in 2175 and 2195. NASA's OSIRIS-REx spacecraft reached asteroid Bennu on Monday after traveling more than 1 billion miles through space.

The war and failing economy have pushed 14 million people, roughly half of Yemen's population, to the brink of starvation . The Saudi-led coalition said it had approved the evacuation of the wounded fighters.

A funeral service will also be held at the Washington National Cathedral before Bush will be flown back to Texas to be buried. The casket will then be transported by Union Pacific Railroad to Texas A&M in College Station for burial on Thursday.

Hamas sentences 6 to death for collaborating with Israel
The report also recalled the November 12 attack on Hamas-run Al-Aqsa TV headquarters in Gaza, which was destroyed by Israeli jets. Six Hamas members were killed when the device apparently exploded after detection near Deir al-Balah in central Gaza in May.

Leafs deal Josh Leivo to Canucks in exchange for AHLer
The Maple Leafs also recalled defenseman Travis Dermott after he was sent down to the Marlies on a temporary basis Sunday. He is eligible for restricted free agency at the end of the year and should see more playing time in Vancouver.

Delhi govt fined Rs 25cr for failing to curb pollution
Authorities have predicted a further drop in air quality thanks to the release of more pollutants in the coming week. The Central Pollution Control Board (CPCB) recorded an overall AQI of 314, which falls in the "very poor" category.

Fred Hoiberg Ousted as Bulls Head Coach
The Bulls must not have liked the way Fred Hoiberg was tanking. "Gar is absolutely safe", Paxson said Monday. Hoiberg was in the fourth season of a guaranteed five-year deal worth a reported $25 million.